345251621 has 24 divisors (see below), whose sum is σ = 410124960. Its totient is φ = 288100800.

The previous prime is 345251617. The next prime is 345251639. The reversal of 345251621 is 126152543.

It is not a de Polignac number, because 345251621 - 2² = 345251617 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345251671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 425306 + ... + 426116.

It is an arithmetic number, because the mean of its divisors is an integer number (17088540).

Almost surely, 2^345251621 is an apocalyptic number.

It is an amenable number.

345251621 is a deficient number, since it is larger than the sum of its proper divisors (64873339).

345251621 is a wasteful number, since it uses less digits than its factorization.

345251621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077 (or 1064 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 345251621 is about 18580.9477960625. The cubic root of 345251621 is about 701.5283754921.

The spelling of 345251621 in words is "three hundred forty-five million, two hundred fifty-one thousand, six hundred twenty-one".